Highly Chemoselective Lithium Metal Reductions of Benzaldehyde Bis(2-Methoxyethyl) Acetals
摘要:
Naphthalene-catalysed reductions of PhCH(OR)(2) (R = Me, CH2CH2OMe) acetals by lithium metal, followed by reactions with electrophiles (H+, TMSCl, nBuBr, CH2=CHCH2Br), proceed with high chemoselectivity when the reductions are carried out at -90 degreesC especially for R = CH2CH2OMe.